Normalish sudoku rules apply : Put the digits 0-9 into each row column and box once each. In order to allow this, each row, column, and box will have one "Schreedinger-cell" which contains exactly 3 digits. The value of any "Schreedinger-cell" is the sum of its 3 digits. This will affect the arithmetic on arrows, renbans, german whispers and kropki dots. Arrows: the values of cells along an arrow sum to the value in that arrow's circle. Renban: the values of cells on a renban (purple) line form a set of non-repeating consecutive numbers in any order. German Whispers: the values of cells along a green line must differ by at least 5. Quadruples: the digits contained in the small white circles must each appear at least once in the 4 surrounding cells. Kropki: black dots separate cells whose values have a 1:2 ratio. Note that two of the renbans and two of the german whispers lines join cells that are a "chess knight's move" apart. For example, R6C1 and R5C3 must differ by at least 5.